Electricity: magnetically operated switches – magnets – and electr – Permanent magnet-actuated switches – Thermomagnetic
Patent
1984-03-09
1985-04-02
Harris, George
Electricity: magnetically operated switches, magnets, and electr
Permanent magnet-actuated switches
Thermomagnetic
335207, H01H 3600
Patent
active
045090297
ABSTRACT:
A thermal switch includes a reed switch surrounded by a centrally located, annular collar made of a ferrite material and a pair of annular permanent magnets spaced from the ends of the ferrite collar and positioned axially toward the ends of the reed switch. The magnetic spacing can be achieved by utilization of non-magnetic spacers, and the entire structure encapsulated to provide further durability, if desired.
REFERENCES:
patent: 3008019 (1961-11-01), Scheidig
patent: 3161742 (1964-12-01), Bagno
patent: 3295081 (1966-12-01), Bowyer et al.
patent: 3895328 (1975-07-01), Kato et al.
patent: 3978299 (1976-08-01), Takai
patent: 4004259 (1977-01-01), Krause
patent: 4023128 (1977-05-01), Itou et al.
patent: 4092586 (1978-05-01), Dinkler et al.
patent: 4121184 (1978-10-01), Dinkler et al.
patent: 4325042 (1982-04-01), Endo et al.
patent: 4389628 (1983-06-01), Sato et al.
Brochure entitled Thermal Reed Switches (TRS) by Tohoku Metal Industries, Ltd.
Harris George
Midwest Components, Inc.
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